Future advanced communication systems are not only expected to provide high bit rates and reliability. With the increasing demand for “everywhere and anytime” available data connec-tion and on communication systems being highly flexible and capable of transmitting multi-service data, the convergence of fixed and wireless communication systems for access and local area networks is supposed to satisfy these demands. Due to low component and installa-tion costs together with high available bandwidth, especially multimode fiber (MMF) optic systems show promise on transmitting radio signals and serving wireless base stations in short range fiber wireless infrastructure. In particular novel multi-functional optoelectronic devices especially designed for MMF systems will enhance the system flexibility and this conver-gence.
In this dissertation a unique reflective electro-optic transceiver (REOT) for optical transmis-sion technology using MMFs is developed with the scope of creating a bi-directional compo-nent for high-speed opto-electrical interfaces such as MMF-wireless base stations. By verti-cally integrating a wavelength selective and partially transparent reflective modulator as transmitter and a photodiode as receiver, the sophisticated transceiver is designed for wave-length division multiplexing (WDM) technique and enables full-duplex transmission – namely bi-directional transmission at the same time – via only one MMF. The vertical integration of the transceiver combines the advantages of easy fiber-chip coupling and low-cost fabrication. The transceiver layout is based on simulations of the layer structure and its resulting electro-optical response. The fabrication process containing the photolithographic structuring and contacting is described in detail.
The transceiver is being characterized in terms of the static and dynamic electrical and electro-optical properties and its performance in analog optical links using MMF. Based on these analyses the transceiver is used in radio-over-fiber (RoF) systems with various types and lengths of multimode glass and polymer optical fibers demonstrating its capability of trans-mitting standard wireless access and local area network signals. It is successfully shown that even in passive operation mode at an operating point of 0 V bias voltage of the electro-absorption modulator various wireless standard signals can optically be transmitted using the REOT in a MMF transmission system. In addition, the full-duplex functionality of the REOT is demonstrated. And finally, an assembly of the transceiver into new LTCC-based fiber-wireless base stations is envisaged.

Rights

Use and reproduction:

Export

DuEPublico
is the institutional repository of the University of Duisburg-Essen.
DuEPublico is driven by the university library and
based on the repository framework MyCoRe and additional Open Source components.
Find out more...